Definately check out the books available at
www.hentzenwerke.com -- the Hacker's Guide is extremely helpful as are all of their books. The tough part is deciding which to get! I use 1001 Things...... A LOT! And Fundaments is a must, and..... well Those 3 Hacker's Guide, Fundaments and 1001 Things (also called KiloFox) will give you an excellent start! And you get an electronic version which you can have always at your computer based finger tips!
Lynette